code review
cleanup
client ensures needed keys are in objs; server just checks them
stagger sql extracts a bit
activity import fix
activity fixes
filter out all known objects (even old ones)
stagger activity calls too a bit
refactor (revert) _id/_hash assignment to serverside; move activity_* related api calls to sqldata cube (since its a sql only api call and it all client side until the client sends the created objects to be persisted); fixed bug in remove api sig - now accepts date arg; refactor csvdata_rows cube to load csv using pandas read_csv method; bumped celery dep to 3.1.6 (fixes strange unicode error)